Register info (#756)

* show the content of registers

* update roadmap for register

* make tslint happy

ROADMAP.md

@@ -304,8 +304,8 @@ Status | Command | Description | Note
 ---|--------|-------------|-----------------
 :running:  | "{char}	        | use register {char} for the next delete, yank, or put | read only registers are not supported yet
 :white_check_mark:   | "*	        | use register `*` to access system clipboard
-   | :reg		| show the contents of all registers
-   | :reg {arg}	        | show the contents of registers mentioned in {arg}
+:white_check_mark:   | :reg		| show the contents of all registers
+:white_check_mark:   | :reg {arg}	        | show the contents of registers mentioned in {arg}
 :white_check_mark:   | :1234:  y{motion}	| yank the text moved over with {motion} into a register
 :white_check_mark:   |    {visual}y	| yank the highlighted text into a register
 :white_check_mark:   | :1234:  yy		| yank N lines into a register

src/cmd_line/commands/register.ts

@@ -0,0 +1,43 @@
+"use strict";
+
+import * as vscode from "vscode";
+import * as node from "../node";
+import {ModeHandler} from "../../mode/modeHandler";
+import { Register} from '../../register/register';
+
+export interface IRegisterCommandArguments extends node.ICommandArgs {
+  arg?: string;
+}
+
+export class RegisterCommand extends node.CommandBase {
+  protected _arguments : IRegisterCommandArguments;
+
+  constructor(args : IRegisterCommandArguments) {
+    super();
+    this._name = 'register';
+    this._shortName = 'reg';
+    this._arguments = args;
+  }
+
+  get arguments() : IRegisterCommandArguments{
+    return this._arguments;
+  }
+
+  async displayRegisterValue(register: string): Promise<void> {
+    let result = (await Register.getByKey(register)).text;
+    if (result instanceof Array) {
+      result = result.join("\n").substr(0, 100);
+    }
+    vscode.window.showInformationMessage(`${register} ${result}`);
+  }
+
+  async execute(modeHandler: ModeHandler): Promise<void> {
+    if (this.arguments.arg !== undefined && this.arguments.arg.length > 0) {
+      await this.displayRegisterValue(this.arguments.arg);
+    } else {
+      vscode.window.showQuickPick(Register.getKeys()).then(async (val) => {
+        await this.displayRegisterValue(val);
+      });
+    }
+  }
+}

src/cmd_line/subparser.ts

@@ -8,6 +8,7 @@ import * as tabCmd from './subparsers/tab';
 import * as fileCmd from './subparsers/file';
 import {parseOptionsCommandArgs} from './subparsers/setoptions';
 import {parseSubstituteCommandArgs} from './subparsers/substitute';
+import {parseRegisterCommandArgs} from './subparsers/register';
 
 // maps command names to parsers for said commands.
 export const commandParsers = {
@@ -58,5 +59,7 @@ export const commandParsers = {
   vnew: fileCmd.parseEditNewFileInNewWindowCommandArgs,
 
   set: parseOptionsCommandArgs,
-  se: parseOptionsCommandArgs
+  se: parseOptionsCommandArgs,
+
+  reg: parseRegisterCommandArgs
 };

src/cmd_line/subparsers/register.ts

@@ -0,0 +1,17 @@
+"use strict";
+
+import * as node from "../commands/register";
+import {Scanner} from '../scanner';
+
+export function parseRegisterCommandArgs(args: string): node.RegisterCommand {
+  if (!args) {
+    return new node.RegisterCommand({});
+  }
+
+  let scanner = new Scanner(args);
+  let name = scanner.nextWord();
+
+  return new node.RegisterCommand({
+    arg: name
+  });
+}

src/register/register.ts

@@ -64,7 +64,10 @@ export class Register {
    */
   public static async get(vimState: VimState): Promise<IRegisterContent> {
     const register = vimState.recordedState.registerName;
+    return Register.getByKey(register);
+  }
 
+  public static async getByKey(register: string): Promise<IRegisterContent> {
     if (!Register.isValidRegister(register)) {
       throw new Error(`Invalid register ${register}`);
     }
@@ -89,4 +92,8 @@ export class Register {
 
     return Register.registers[register];
   }
+
+  public static getKeys(): string[] {
+    return Object.keys(Register.registers);
+  }
 }